<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `ReentrantMutex` struct in crate `lock_api`."><metaname="keywords"content="rust, rustlang, rust-lang, ReentrantMutex"><title>lock_api::ReentrantMutex - Rust</title><linkrel="stylesheet"type="text/css"href="../normalize.css"><linkrel="stylesheet"type="text/css"href="../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../dark.css"><linkrel="stylesheet"type="text/css"href="../light.css"id="themeStyle"><scriptsrc="../storage.js"></script><noscript><linkrel="stylesheet"href="../noscript.css"></noscript><linkrel="shortcut icon"href="../favicon.ico"><styletype="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><bodyclass="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../lock_api/index.html'><divclass='logo-container'><imgsrc='../rust-logo.png'alt='logo'></div></a><pclass='location'>Struct ReentrantMutex</p><divclass="sidebar-elems"><divclass="block items"><aclass="sidebar-title"href="#methods">Methods</a><divclass="sidebar-links"><ahref="#method.force_unlock">force_unlock</a><ahref="#method.force_unlock_fair">force_unlock_fair</a><ahref="#method.get_mut">get_mut</a><ahref="#method.into_inner">into_inner</a><ahref="#method.lock">lock</a><ahref="#method.new">new</a><ahref="#method.raw">raw</a><ahref="#method.try_lock">try_lock</a><ahref="#method.try_lock_for">try_lock_for</a><ahref="#method.try_lock_until">try_lock_until</a></div><aclass="sidebar-title"href="#implementations">Trait Implementations</a><divclass="sidebar-links"><ahref="#impl-Debug">Debug</a><ahref="#impl-Default">Default</a><ahref="#impl-From%3CT%3E">From<T></a><ahref="#impl-Send">Send</a><ahref="#impl-Sync">Sync</a></div><aclass="sidebar-title"href="#synthetic-implementations">Auto Trait Implementations</a><divclass="sidebar-links"><ahref="#impl-Unpin">Unpin</a></div><aclass="sidebar-title"href="#blanket-implementations">Blanket Implementations</a><divclass="sidebar-links"><ahref="#impl-Any">Any</a><ahref="#impl-Borrow%3CT%3E">Borrow<T></a><ahref="#impl-BorrowMut%3CT%3E">BorrowMut<T></a><ahref="#impl-From%3CT%3E">From<T></a><ahref="#impl-Into%3CU%3E">Into<U></a><ahref="#impl-TryFrom%3CU%3E">TryFrom<U></a><ahref="#impl-TryInto%3CU%3E">TryInto<U></a></div></div><pclass='location'><ahref='index.html'>lock_api</a></p><script>window.sidebarCurrent={name:'ReentrantMutex',ty:'struct',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../settings.html"><imgsrc="../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../src/lock_api/remutex.rs.html#142-145'title='goto source code'>[src]</a></span><spanclass='in-band'>Struct <ahref='index.html'>lock_api</a>::<wbr><aclass="struct"href=''>ReentrantMutex</a></span></h1><divclass="
<p>This type is identical to <code>Mutex</code> except for the following points:</p>
<ul>
<li>Locking multiple times from the same thread will work correctly instead of
deadlocking.</li>
<li><code>ReentrantMutexGuard</code> does not give mutable references to the locked data.
Use a <code>RefCell</code> if you need this.</li>
</ul>
<p>See <ahref="struct.Mutex.html"><code>Mutex</code></a> for more details about the underlying mutex
primitive.</p>
</div><h2id='methods'class='small-section-header'>Methods<ahref='#methods'class='anchor'></a></h2><h3id='impl'class='impl'><codeclass='in-band'>impl<R: <aclass="trait"href="../lock_api/trait.RawMutex.html"title="trait lock_api::RawMutex">RawMutex</a>, G: <aclass="trait"href="../lock_api/trait.GetThreadId.html"title="trait lock_api::GetThreadId">GetThreadId</a>, T><aclass="struct"href="../lock_api/struct.ReentrantMutex.html"title="struct lock_api::ReentrantMutex">ReentrantMutex</a><R, G, T></code><ahref='#impl'class='anchor'></a><aclass='srclink'href='../src/lock_api/remutex.rs.html#187-224'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.new'class="method"><codeid='new.v'>pub fn <ahref='#method.new'class='fnname'>new</a>(val: T) -><aclass="struct"href="../lock_api/struct.ReentrantMutex.html"title="struct lock_api::ReentrantMutex">ReentrantMutex</a><R, G, T></code><aclass='srclink'href='../src/lock_api/remutex.rs.html#206-216'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Creates a new reentrant mutex in an unlocked state ready for use.</p>
</div><h4id='method.into_inner'class="method"><codeid='into_inner.v'>pub fn <ahref='#method.into_inner'class='fnname'>into_inner</a>(self) -> T</code><aclass='srclink'href='../src/lock_api/remutex.rs.html#221-223'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Consumes this mutex, returning the underlying data.</p>
</div></div><h3id='impl-1'class='impl'><codeclass='in-band'>impl<R: <aclass="trait"href="../lock_api/trait.RawMutex.html"title="trait lock_api::RawMutex">RawMutex</a>, G: <aclass="trait"href="../lock_api/trait.GetThreadId.html"title="trait lock_api::GetThreadId">GetThreadId</a>, T: ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>><aclass="struct"href="../lock_api/struct.ReentrantMutex.html"title="struct lock_api::ReentrantMutex">ReentrantMutex</a><R, G, T></code><ahref='#impl-1'class='anchor'></a><aclass='srclink'href='../src/lock_api/remutex.rs.html#226-307'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.lock'class="method"><codeid='lock.v'>pub fn <ahref='#method.lock'class='fnname'>lock</a>(&self) -><aclass="struct"href="../lock_api/struct.ReentrantMutexGuard.html"title="struct lock_api::ReentrantMutexGuard">ReentrantMutexGuard</a><R, G, T></code><aclass='srclink'href='../src/lock_api/remutex.rs.html#246-250'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Acquires a reentrant mutex, blocking the current thread until it is able
to do so.</p>
<p>If the mutex is held by another thread then this function will block the
local thread until it is available to acquire the mutex. If the mutex is
already held by the current thread then this function will increment the
lock reference count and return immediately. Upon returning,
the thread is the only thread with the mutex held. An RAII guard is
returned to allow scoped unlock of the lock. When the guard goes out of
scope, the mutex will be unlocked.</p>
</div><h4id='method.try_lock'class="method"><codeid='try_lock.v'>pub fn <ahref='#method.try_lock'class='fnname'>try_lock</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="../lock_api/struct.ReentrantMutexGuard.html"title="struct lock_api::ReentrantMutexGuard">ReentrantMutexGuard</a><R, G, T>></code><aclass='srclink'href='../src/lock_api/remutex.rs.html#260-267'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Attempts to acquire this lock.</p>
<p>If the lock could not be acquired at this time, then <code>None</code> is returned.
Otherwise, an RAII guard is returned. The lock will be unlocked when the
guard is dropped.</p>
<p>This function does not block.</p>
</div><h4id='method.get_mut'class="method"><codeid='get_mut.v'>pub fn <ahref='#method.get_mut'class='fnname'>get_mut</a>(&mut self) ->&mut T</code><aclass='srclink'href='../src/lock_api/remutex.rs.html#274-276'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Returns a mutable reference to the underlying data.</p>
<p>Since this call borrows the <code>ReentrantMutex</code> mutably, no actual locking needs to
take place---the mutable borrow statically guarantees no locks exist.</p>
</div><h4id='method.force_unlock'class="method"><codeid='force_unlock.v'>pub unsafe fn <ahref='#method.force_unlock'class='fnname'>force_unlock</a>(&self)</code><aclass='srclink'href='../src/lock_api/remutex.rs.html#290-292'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Forcibly unlocks the mutex.</p>
<p>This is useful when combined with <code>mem::forget</code> to hold a lock without
the need to maintain a <code>ReentrantMutexGuard</code> object alive, for example when
<p>This method must only be called if the current thread logically owns a
<code>ReentrantMutexGuard</code> but that guard has be discarded using <code>mem::forget</code>.
Behavior is undefined if a mutex is unlocked when not locked.</p>
</div></div><h3id='impl-3'class='impl'><codeclass='in-band'>impl<R: <aclass="trait"href="../lock_api/trait.RawMutexTimed.html"title="trait lock_api::RawMutexTimed">RawMutexTimed</a>, G: <aclass="trait"href="../lock_api/trait.GetThreadId.html"title="trait lock_api::GetThreadId">GetThreadId</a>, T: ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>><aclass="struct"href="../lock_api/struct.ReentrantMutex.html"title="struct lock_api::ReentrantMutex">ReentrantMutex</a><R, G, T></code><ahref='#impl-3'class='anchor'></a><aclass='srclink'href='../src/lock_api/remutex.rs.html#327-357'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.try_lock_for'class="method"><codeid='try_lock_for.v'>pub fn <ahref='#method.try_lock_for'class='fnname'>try_lock_for</a>(<br> &self, <br> timeout: R::<aclass="type"href="../lock_api/trait.RawMutexTimed.html#associatedtype.Duration"title="type lock_api::RawMutexTimed::Duration">Duration</a><br>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="../lock_api/struct.ReentrantMutexGuard.html"title="struct lock_api::ReentrantMutexGuard">ReentrantMutexGuard</a><R, G, T>></code><aclass='srclink'href='../src/lock_api/remutex.rs.html#334-341'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Attempts to acquire this lock until a timeout is reached.</p>
<p>If the lock could not be acquired before the timeout expired, then
<code>None</code> is returned. Otherwise, an RAII guard is returned. The lock will
be unlocked when the guard is dropped.</p>
</div><h4id='method.try_lock_until'class="method"><codeid='try_lock_until.v'>pub fn <ahref='#method.try_lock_until'class='fnname'>try_lock_until</a>(<br> &self, <br> timeout: R::<aclass="type"href="../lock_api/trait.RawMutexTimed.html#associatedtype.Instant"title="type lock_api::RawMutexTimed::Instant">Instant</a><br>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="../lock_api/struct.ReentrantMutexGuard.html"title="struct lock_api::ReentrantMutexGuard">ReentrantMutexGuard</a><R, G, T>></code><aclass='srclink'href='../src/lock_api/remutex.rs.html#349-356'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Attempts to acquire this lock until a timeout is reached.</p>
<p>If the lock could not be acquired before the timeout expired, then
<code>None</code> is returned. Otherwise, an RAII guard is returned. The lock will
</div></div><h3id='impl-TryFrom%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><T>, </span></code><ahref='#impl-TryFrom%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#571-577'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='associatedtype.Error'class="type"><codeid='Error.t'>type <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error'class="type">Error</a> = <aclass="enum"href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html"title="enum core::convert::Infallible">Infallible</a></code></h4><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4id='method.try_from'class="method hidden"><codeid='try_from.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from'class='fnname'>try_from</a>(value: U) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><T, <T as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#574-576'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-Into%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html"title="trait core::convert::From">From</a><T>, </span></code><ahref='#impl-Into%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#543-548'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.into'class="method hidden"><codeid='into.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into'class='fnname'>into</a>(self) -> U</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#545-547'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-TryInto%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html"title="trait core::convert::TryInto">TryInto</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><ahref='#impl-TryInto%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#559-566'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='associatedtype.Error-1'class="type"><codeid='Error.t-1'>type <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error'class="type">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a></code></h4><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4id='method.try_into'class="method hidden"><codeid='try_into.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into'class='fnname'>try_into</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><U, <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#563-565'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-Borrow%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html"title="trait core::borrow::Borrow">Borrow</a><T> for T <spanclass="where fmt-newline">where<br> T: ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-Borrow%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#213-215'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.borrow'class="method hidden"><codeid='borrow.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow'class='fnname'>borrow</a>(&self) ->&T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#214'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Immutably borrows from an owned value. <ahref="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
</div></div><h3id='impl-BorrowMut%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html"title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T <spanclass="where fmt-newline">where<br> T: ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-BorrowMut%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#218-220'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.borrow_mut'class="method hidden"><codeid='borrow_mut.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut'class='fnname'>borrow_mut</a>(&mut self) ->&mut T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#219'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Mutably borrows from an owned value. <ahref="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
</div></div><h3id='impl-Any'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a> for T <spanclass="where fmt-newline">where<br> T: 'static + ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-Any'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/any.rs.html#100-102'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.type_id'class="method hidden"><codeid='type_id.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id'class='fnname'>type_id</a>(&self) -><aclass="struct"href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html"title="struct core::any::TypeId">TypeId</a></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/any.rs.html#101'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <ahref="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
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